Lab 2 Micrometer Instruments Prerequisite: Chapter 7, Micrometer Instruments Introduction: The increased precision of mi

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Lab 2 Micrometer Instruments Prerequisite: Chapter 7, Micrometer Instruments Introduction: The increased precision of micrometers allows them to be used for a number of diverse measurements, primarily those dealing with some form of inside or depth measurement. Micrometers may incorporate a standard four-digit mechanical readout or have a digital readout. The purpose of this lab is to explore the general use of the standard mechanical readout micrometer, to affirm how to read the measurement to the fourth decimal place, and to take measurements and understand the variations that can occur with individual users and among multiple users. Items needed: Data recording tools A set of standard SAE and/or metric gage blocks. The referenced numbered metal cubes to use for measurement Provide various one-inch micrometers for the students and multiple sizes for demonstration purposes. Micrometers from multiple sources are beneficial but not necessary. A set of digital micrometers may be used to confirm the students' manual-scale readings, but NOT as an alternative to learning how to read a micrometer scale.
LAB 5 21 Name: Date: EXERCISE 1 Observation: Familiarize yourself with the micrometers provided for this lab exercise. Your instructor will review the proper procedure for their use, the measurement technique, and how to read the instrument's measurement. Follow your instructor's instructions for verifying the zero point on your micrometer. Practice using a one inch, two inch, and/or three-inch micrometer. EXERCISE 2 Calibration: Using a one-inch gage block, take three readings to check the accuracy of the instrument. Compare your readings with those of other students. Are their variations? Did all students measure the same gage block? What are the possible reasons for variations, if any? EXERCISE 3 Measurements: Measure and record all the dimensions of three metal cubes, keeping a detailed record of which measurement corresponded to a specific dimension using your assigned micrometer. Each measurement should be taken four times. Perform a statistical analysis to determine the mean, median, and mode for each dimension. Calculate the standard deviation or repeatability for the instrument used. 22 LAB 5 EXERCISE 4 Join up with your group of students, and using the same micrometer, repeat Exercise 3. This time calculate the standard deviation based on your group of users. Compare the standard deviation from Exercises 3 and 4 and explain why there is variation.
22 LAB 5 EXERCISE 4 Join up with your group of students, and using the same micrometer, repeat Exercise 3. This time calculate the standard deviation based on your group of users. Compare the standard deviation from Exercises 3 and 4 and explain why there is variation. REPORT Submit your findings for Exercises 1 - 4. Use the following sections to create your detailed report. Objective: Equipment used:
Environmental: Procedure: Data: Conclusion: You i may find it beneficial to use a spreadsheet format with statistical capabilities to compare your hand-calculated values with the software's analysis.